Revert "[zsh] Reload shared history before searching (#2251)"

This reverts commit b62a74b3.

https://github.com/junegunn/fzf/pull/2251#issuecomment-740551383

shell/key-bindings.zsh

@@ -107,7 +107,6 @@ bindkey '\ec' fzf-cd-widget
 fzf-history-widget() {
   local selected num
   setopt localoptions noglobsubst noposixbuiltins pipefail no_aliases 2> /dev/null
-  [[ -o sharehistory ]] && fc -RI
   selected=( $(fc -rl 1 | perl -ne 'print if !$seen{(/^\s*[0-9]+\**\s+(.*)/, $1)}++' |
     FZF_DEFAULT_OPTS="--height ${FZF_TMUX_HEIGHT:-40%} $FZF_DEFAULT_OPTS -n2..,.. --tiebreak=index --bind=ctrl-r:toggle-sort $FZF_CTRL_R_OPTS --query=${(qqq)LBUFFER} +m" $(__fzfcmd)) )
   local ret=$?